Kinetics and mechanism of the adsorption of methylene blue onto ACFs
- 期刊名字:中国矿业大学学报(英文版)
- 文件大小:
- 论文作者:YANG Zhi-yuan
- 作者单位:Department of Chemistry & Chemical Engineering,Geology Institute
- 更新时间:2023-02-26
- 下载次数:次
The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied.The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Freundlich isotherm equation. Adsorption measurements show that the process is very fast. The adsorption data were modeled using first- and second-order kinetic equations and intra-particle diffusion models. It was found that the first-order kinetic equation could best describe the adsorption kinetics. The adsorption process was found to be complex and controlled by both surface and pore diffusion with surface diffusion at the earlier stages, followed by pore diffusion at the later stages. The thermodynamic parameters △G0, △S0 and △H0, have been calculated. The thermodynamics of the MB-ACF system indicate that the adsorption process is spontaneous.
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